I've found this paper ("Practical Functional Reactive Programming") , the authors (as far as I understand) try to create an FRP library in Python in the spirit of Yampa.
I've also found these interesting slides featuring SPJ! The slides seem conclude that it is not so easy to implement FRP in a dynamically typed language - unfortunately the bullet points in those slides do not really explain why.
Why are there, apparently, not so many FRP implementations in Python? Why is it more prevalent in Haskell? Is the static typing really needed for FRP? How much do we gain by static typing in FRP? Is it super essential or can one get by without it (if one is only writing a few thousand lines of FRP code)?
I really wonder, if SodiumFRP can be implemented in C, Java, Haskell etc. then what is the problem with Python?
It is relevant to note that in JS there is no real FRP implementation either at the moment (2015.08.04), so that suggests that the lack of static typing in Python is the reason, I am not convinced though, hence the question.
UPDATE: Interestingly, I've came across Flow Based Programming in Python. How do FBP and FRP relate to each other ? They only seem to differ just a little bit, at least, I have that first impression when I compare the bottom of the acronyms' middle characters.